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Class Information
Number: 313/591
Name: Electric lamp and discharge devices > With gas or vapor > Three or more electrode discharge device > Having cathode heater
Description: Subject matter wherein there is a cathode which is electrically heated by the passage of an electrical current through an electrical resistance element which may be the cathode.

Sub-classes under this class:

Class Number Class Name Patents
313/592 With control electrode 14

Patents under this class:

Patent Number Title Of Patent Date Issued
7397193 Discharge light source with electron beam excitation Jul. 8, 2008
7009329 Thermally optimized cold cathode heater Mar. 7, 2006
5786903 Multi-power control system for scanners Jul. 28, 1998
5491375 Cathode, electron gun, and cathode-ray tube having a heating element for use during cold electron emisson Feb. 13, 1996
4745325 Heater for indirect-heated cathode May. 17, 1988
4668896 Linear geometry thyratron May. 26, 1987
4356428 Lighting system Oct. 26, 1982

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